If you have a form in Microsoft Forms you don't need anymore, you can easily get rid of it.
To delete any survey, quiz, or other type of form, navigate to the Microsoft Forms site at forms.office.com, and then sign in with your Office 365 school or work credentials or Microsoft account (Hotmail, Live, or Outlook.com).
Find the form you want to delete in the list of forms, click the ellipses button (…) in the upper right corner of the form preview window, and then click Delete. You’ll be asked to confirm the deletion.
There is no way to recover a deleted form. If you accidentally delete a form, you'll need to re-create it from scratch.
When you delete a form, you also permanently delete all responses to the form.
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